Re: OMAC help

From: Jack Lloyd (lloyd_at_jhu.edu)
Date: 06/14/03 

Date: Sat, 14 Jun 2003 12:52:21 -0400

On Fri, 13 Jun 2003 18:29:05 -0400, Brian Gladman wrote:

> Maybe I am missing something but they seemed almost the same in software
> - just two small code sequences (gf_mulx & gfdivx) in place of one
> (gf_mulx). Is there more to it than this?

Nope. The part I like about it is you don't have to remember (or
calculate) what the inverse of the polynomial is, only the poly
itself. Perhaps I overstate OMAC1's advantages, but I've always
had a hard time with polynomial arithmetic for some reason, so
anything that reduces how much of it I have to think about is a
good thing to me. (Also, anything that reduces code size at no cost ==
good).

-Jack

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